Microstructures and properties of wire-arc additively manufactured ultra-high strength aluminum alloy under different heat treatments

• DOI: 10.1016/j.jmrt.2023.03.100
• Publication Date: 2023-03-16T07:33:46Z
• Authors: Xinpeng Guo; Peng Xue; Huijun Li; Rongzheng Xu; Dingrui Ni; Zengxi Pan; Zongyi Ma
• Keywords: Al–Zn–Mg–Cu-Sc alloy; Corrosion behavior; Mining engineering. Metallurgy; TN1-997; 02 engineering and technology; Wire-arc additive manufacturing; 0210 nano-technology; Heat treatment; Microstructure; Mechanical property; Al–Zn–Mg–Cu-Sc alloy

The microstructures, mechanical properties and corrosion behaviors of the ultra-high strength Al–Zn–Mg–Cu-Sc aluminum alloy fabricated by wire-arc additive manufacturing process using a self-prepared 7B55-Sc filler wire were systematically investigated under different heat treatments. results showed that microstructures as-deposited, T6, T73, retrogression re-aging (RRA) treatments all composed fine equiaxed grains with size about 6.0 μm. grain boundary precipitates (GBPs) as-deposited sample very coarse continuously distributed along boundaries, intragranular (IGPs) mainly consisted small amount ηMg(Zn,Cu,Al)2 η′ phases. After T6 treatment, GBPs became much finer, but still boundaries. IGPs GP zones RRA coarser discontinuously phases T73 sparsely heat-treated achieved highest tensile 618 MPa. While was sacrificed up to 17% compared sample, resistance best conditions. 10% lower than condition, better sample.